Ceiling speaker and signal source
A system for controlling distribution of sound in a multi-channel sound system such as a "surround sound" system in a movie theater. Control signals are used to steer, or distribute, portions of...

Sterophonic sound field expansion device
A stereophonic sound field generation device includes a left side localized reflected sound generation circuit which generates a left channel reflected sound signal and a left channel cancel...

Sound Reproduction systems
A stereophonic sound reproduction system is aimed at synthesizing at a multiplicity of points (L) in the listening space. An auditory effect obtaining at corresponding points (K) in the recording...

406

5727067

Sound field control device
A sound field control device includes a surround decoder for decoding an input surround encode signal and generating three channel signals of L, C and R to be reproduced in front left, front...

Vocal mix circuit
A vocal mix circuit shifts the phase of a mixed audio signal using a phase shifter, and achieves a mixed signal emphasizing the voice components thereof, by subtracting a signal which is not...

Surround sound processor system
A surround sound processor system includes an in-phase decoder circuit, an out-of-phase decoder circuit, and a plurality of audio amplifiers. In a wireless embodiment, the surround sound processor...

Audio processing apparatus
An audio processing apparatus is arranged to be capable of attenuating only an unnecessary wind noise without cutting off the low frequency part of sounds picked up. In the apparatus, a first low...

Audio circuit producing enhanced ambience
A circuit for use in connection with a stereo audio system to increase the ambience includes a differencing circuit for receiving a left stereo input and a right stereo input. The differencing...

Remote speaker for surround-sound applications
A surround-sound system for use with conventional TV sets, using a wireless remote bipolar rear speaker (or two conventional speakers fed out of phase) for the surround (difference) channels. The...

419

5666425

Plural-channel sound processing
An artificial head (2) and a plurality of discrete monophonic microphones (8, 10, 12) are used to record one or more sound sources. The signals (14, 16, 18) from each of the microphones (8, 10,...

420

5657391

Sound image enhancement apparatus
A sound image enhancement apparatus for reproducing two-channel stereo signals with speakers, includes for each channel a first phase shifter and a second phase shifter for introducing different...

421

5642424

Device for connecting external sound generator
A device for connecting an external sound generator having a plug and being incorporated in an apparatus having a circuit outputting an electrical sound signal. The external sound generator is,...

422

5642422

Digital surround sound method and apparatus
Method and apparatus for implementing surround sound in an audio system having a number of audio output devices, and audio output buffers associated with the audio output devices adapted to output...

423

5636283

Processing audio signals
A system for mixing five channel sound which surrounds an audio plane. The position of a sound source is displayed on a VDU (16) relative to the position of a notional listener (31). The sound...

Sound field control system
First and second processing circuits are provided for carrying out a reverberation process of an input signal, and first and second filters are provided for applying amplitude characteristics to...

427

5594801

Ambient expansion loudspeaker system
A sound reproduction system has audio drivers for producing audio outputs in response to a left channel signal and a right channel signal and for producing an expanded acoustic image. The sound...

Stereo decoder with cross-talk compensation
A circuit arrangement for converting of a stereo signal having a mid-plane signal and a side signal into an output signal for each of two audio signal channels. By this circuit arrangement, a...

430

5572591

Sound field controller
According the present invention, a sound field controller for reproducing a sound field with presence comprising; input terminals for inputting an audio signal having a first and a second channel...

Voice canceler with simulated stereo output
A vocal canceler receives left- and right-channel input signals, and combines their non-vocal components into a single monaural karaoke signal. It then shifts the monaural karaoke signal by one...

433

5541999

Audio apparatus having a karaoke function
An audio apparatus having a plurality of modes as a karaoke reproduction to superimpose a sound signal from a microphone on an audio signal from a stereo sound source. A subtracting circuit is...

434

5515442

Mono/stereo switching circuit
A mono/stereo switching circuit wherein first, second, and third switches operate in circuit which is arranged so that (1) when the first switch is engaged, and the mono/stereo switch is engaged,...

435

5509078

Circuit for preventing crosstalk
An operational amplifier is applied with an audio signal at a non-inverting terminal thereof for amplifying the audio signal. A crosstalk cancelling circuit is provided for reducing the output of...

436

5506907

Channel audio signal encoding method
An encoding method and apparatus for audio signals for generating ten-channel audio signals from audio signals of a left channel, a left center channel, a center channel, a right center channel, a...

Listening and display unit
A listening and display unit for playing and promoting audio recordings, including a display surface for promotional and instructional messages, two or more audio jacks connected by an audio cable...

441

5440638

Stereo enhancement system
The sound field in a stereo reproduction system is enhanced by a preprocessor that removes a portion of the audio information that is common or substantially common to both the left and right...

442

5434921

Stereo image control circuit
A stereo imaging circuit has a first channel input terminal, and a second channel input terminal; a variable resistance in circuit with each of the first and the second channel input terminals; a...

Signal processor for sound image enhancement
A signal processor for sound image enhancement of stereophonic signals provides fluctuating coherence between the left channel and right channel outputs by crossfeeding a high pass portion of the...

Audio image enhancement system
Stereo processing circuitry is provided for modifying stereo signals so as to enhance the perception of imaging and ambience in non-ideal listening locations and confined environments such as the...

447

5400411

Volume/balance control apparatus
A volume/balance control apparatus includes a plurality of resistance arrays which correspond to a plurality of channels, a volume operator and a balance operator which generate volume and balance...

Passive surround sound circuit
A passive circuit for decoding surround-sound signals using a transformer having center-tapped primary and secondary windings. The line level left and right signals are introduced into the primary...